Means for grinding gears



1,633,958 June 1927' R. w. SCHROTT MEANS FOR GRINDING GEARS Filed Nov.5. 1923 glig!!! WITNESSES: INVENTOR fig M Robe/*7 W'Schrofi atented June28, 1927.

STTES 1,633,958 PATENT oFFIcE.

ROBERT W. SCHRO'IT, 0F WILKINSBURG, PENNSYLVANIA, ASSIGNOR T0 WESTING-HOUSE ELECTRIC 86 MANUFACTURING COMPANY, A CORPORATION OF PENNSYL-VANIA.

MEANS FOR GRINDING GEARS.

Applicatienfiled November 5, 1923. Serial No. 672,700.

My invention relates to gear grinding means, more particularly to anabrasive element adapted to the grinding of gear teeth by a generatingprocess;

it is among the objects of my invention to provide a grinding elementwhich shall be of simple and inexpensive construction and in which theabrasive material shall be adjustable to compensate for wear and to theworking diameter desired.

in a copending application of George M.

I Eaton, Serial No. 671,142, filed Oct. 27,

1923, for gear grinding device, and assigned to the WestinghouseElectric & Manufacturing Company, is described a grinding ele mentcomprising a hub member having abrasive insert portions or teeth membersmounted thereon. This renders the construction of such grinding elementsless expensive in that it is only necessary to provide a small amount ofthe expensive abrasive on the surface of an inexpensive spider ofrelatively large diameter.

7 it is the purpose of my present invention to modify the structuredescribed therein in such manner as to render it capable of adjustment,which is necessary to compensate for the wear produced in operation.

With this object in view, I mount the abrasive members on movableinserts or blocks which are adjustable by means of screw and nutmechanisms and I further propose to employ novel means for securing theabrasive portions in their respective suports. e P In the accompanyingdrawin constituting a part hereof and in which ike referenc charactersdesignate like parts:

Fig. 1 is a view partially in elevation and partially in cross-sectionof a grinding element embodying the principles of my invention, v

Fig. 2 is a cross-sectional view of a fragmentary portion of the elementshown 1n Fig. 1, taken along the lines II--II thereof,

Fig. 3 is a similar cross-sectional view illustrating another means forsecuring the I abrasive tooth -segments,

Fi 4. is an elevational view of the grinding e ement embodying thefastening means of Fig. 3, and

Figs. 5 and 6 are cross-sectional views illustrating means for securingthe abrasive,

tooth'elements.

Rescuing to Fig. 1, I employ a hub memcollar 8 being connected by aplurality of 5 links 10 to the tongue portions 6 of the movable blocks5.

Links 10 are pivotally connected to the collar 8 and blocks 5 to permitrelative movement thereof whereby, when the former is advanced axiallytowards the center of the hub, the links are straightened in a verticaldirection causing the blocks 5 to move radially outward on the rim 3.The member 9 is adapted to engage one-edge of the blocks 75 5 tomaintain them in their proper alinement and the members 8 and 9 arein'screwthreaded engagement with adjusting screws 11 and 12,respectively, which are journalled in openings 13 and 14 of the endplate 2.

The adgustment of the grinding element is briefly as follows: Byadjusting the screw 11, the collars 8 and 9 are moved axially in eitherdirection to raise or lower the-blocks 5 in the slots 4 of the rim 3 andthe screw 12 actuates the collar 9- to bring it in contact with theedges of the blocks 5 to insure proper alinement of the outer facecarrying the abrasive tooth portion 15.

Such adjustment is desirable to take up the wear "of the abrasivematerial in order that as the teeth are reduced in cross-section, thediameter of the grinding element ma be increased to permit redressingthe feet to their proper contour and dimensions.

The abrasive tooth portions 15 may consist of segments havingdove-tailed bases 16 adapted to fit in helical grooves 17 formed in theblocks 5 andthe segments may be screws 18 as shown in ,ig. 5.

In Figs. 3, 4 and 6 I have illustrated another means for securing thesegments 15 which comprises providing slots 19 in the secured in thegrooves b a plurality of set 100 underside of the blocks 5. The slots 19are s method of fastening t e segments firmly 110 seats them in thegrooves 17 and secures them in place.

' As shown in Figs. 5 and 6, the lower portion of the abrasive materialmay be provided with sheet metal liners or clips 22 corresponding inshape to the grooves 17 and dove-tail portion 16 to withstand the pres-;ureof the set screws 18 and to provide a more accurate fitting of theabrasive material in the grooves of the blocks.

It is evident from the foregoing description of my invention thatgrinding elements made in accordance therewith provide a stron durablestructure for grinding gear whee s which by reason of the insertedteeth, is particularly applicable to the grinding of gear teeth ofcoarse pitch, although it may be modified for grinding gear teeth ofrelatively fine pitch.

Such a grinding device further facilitates the renewal of the abrasivematerial and permits quick and simple adjustment to take up the wear.

Although I have described a specific embodiment of my invention it wille obvious to those skilled in the art that various modifications may bemade in the details of construction. the manner of securing the abrasivematerial and the size and proportion of the several co-operating partswithout departing from the principles herein set forth.

I claim as my invention An abrasive device comprising a slotted hubmember, abrasive material secured in supports movably mounted in saidslots and means for adjusting said abrasive material.

2. An abrasive device comprising a slotted hub member, movable blocksmounted in said slots, abrasive inserts secured in said blocks and meansfor adjusting said blocks radially.

3. An abrasive device compgiising a slotted hub member, movable blocmounted in said slots, abrasive inserts secured in said inc-assessblocks and means for adjusting said blocks radially and axially.

a. An abrasive device comprising a cylindrical hub having angularlyspaced axial slots, blocks movably mounted in said slots, a movablecollar in said'hub, links connecting said collar and said blocks andmeans for effecting axial movement of said collar.

5. An abrasive device comprising a hollow hub having angularly spacedaxial slots in its outer periphery, blocks carrying abrasive toothsegments mounted in said slots, a collar disposed within the hub, linksconnecting said blocks and collar, another collar in co-operativeengagement with said blocks and means for effecting relative adjustmentof said blocks and collars.

6. An abrasive device comprising a hollow hub having angularly spacedaxial slots in its outer periphery, blocks carrying abrasive toothsegments mounted in said slots, a col lar disposed within the hub, linksconnecting said blocks and collar, another collar in cooperativeengagement with said blocks and screw-threaded adjusting means for saidcollars.

7. An abrasive device comprising a sleeve member having end platessecured thereto and having slots in the outer periphery thereof, blocksprovided with abrasive inserts disposed in said slots, a pair of movablecollars, one being co-operatively engaged with said blocks by pivotallyconnecting links and the other engaging one of the end faces of saidblocks, a plurality of screws journalled in one of the end plates eachhaving an end in screw thread engage ment with one of said collars andmeans for mounting said device for rotation.

lln testimony whereof, I have hereunto subscribed my name this 29th dayof October, 1923.

ROBERT W. SCHROTT.

